Privacy Policy for Age Calculator

Effective Date: May 23, 2026

Age Calculator is a mobile application that calculates your age and lets you take several quick self-assessment tests (reaction time, memory, math speed, vision, hearing, tap trail) to estimate a "biological" or test-based age. 김민형 ("rexyrex", "we", "us", "our") provides this app and collects, uses, and shares information only as described in this policy. By downloading, installing, or using Age Calculator, you agree to this Privacy Policy. If you do not agree, please uninstall the app.

1. Information We Collect

Some information is gathered automatically when you open the app; other information stays only on your device. We do not ask you to create an account, and we do not collect your name, address, phone number, or email.

1.1 Automatically Collected Information

When you use Age Calculator, the following information may be collected automatically:

• Device model, manufacturer, and hardware characteristics
• Operating system name and version
• App version and build number
• Approximate region or country (derived from the device's locale or coarse IP signal — not precise location)
• Language setting
• App usage events such as screen views, button taps, test completions, and session duration
• Crash diagnostics, including stack traces and the state of the app at the moment of a crash
• Advertising identifiers (IDFA on iOS, Android Advertising ID on Android), when available and not reset by you

1.2 Information You Provide

Age Calculator does not require you to sign in or create a profile. The only inputs you provide are your date of birth and your interactions during the in-app tests (such as taps, answers, and reaction times). This input is processed on your device to produce a result. We do not transmit your date of birth or individual test answers to our servers — we do not operate any user-data server.

1.3 Advertising Identifiers

Because Age Calculator shows ads through Google AdMob, your device's advertising identifier may be read by the AdMob SDK to deliver and measure advertisements. You can reset or limit this identifier at any time in your device's system settings.

1.4 Locally Stored Preferences

The app stores small pieces of data on your device — for example, your selected language, your last entered date of birth, theme settings, and flags that record whether you have seen certain prompts. This data lives only on your device, is not transmitted to us, and is removed when you uninstall the app.

2. How We Use Your Information

We use the information described above to:

• Provide and operate the app's core features (age calculation and the various tests)
• Remember your settings and preferences between sessions
• Detect, diagnose, and fix crashes and bugs
• Understand which features are used so we can improve the app
• Deliver and measure advertisements

We do not use your information to build advertising or marketing profiles about you, and we do not sell your information.

3. Legal Basis for Processing

Where data protection laws such as the GDPR apply, we rely on the following legal bases:

• Legitimate interests — for app stability, crash diagnostics, and basic usage analytics that help us maintain and improve the app
• Consent — for advertising identifiers and personalized advertising, where required by your jurisdiction; you may withdraw consent through your device's system settings
• Performance of a contract — to deliver the functionality you requested by using the app

You may withdraw consent at any time by adjusting your device's privacy settings, by disabling ad personalization in your device's settings, or by uninstalling the app.

4. Sharing Your Information

We share information only with the third-party service providers listed below. Each of these providers has its own privacy policy that governs how they handle the data they receive.

• Google Firebase (Analytics, Crashlytics) — collects anonymous usage events and crash diagnostics. See Firebase Privacy and Security and the Google Privacy Policy.
• Google AdMob — serves and measures the advertisements displayed inside the app. See How Google uses information from sites or apps that use our services.
• Apple App Store / Google Play — distribute the app and, where applicable, provide platform-level diagnostic and usage reports. See the Apple Privacy Policy and the Google Privacy Policy.

We do not sell your personal information to any third party.

5. Advertising and Tracking

Age Calculator displays banner and interstitial advertisements served by Google AdMob. To deliver and measure these ads, AdMob may use:

• Your device's advertising identifier (IDFA on iOS, Android Advertising ID on Android)
• General device and app information (model, OS version, app version, language)
• Approximate, non-precise location derived from network signals
• Interaction signals such as ad views and ad clicks

You can control ad personalization and reset or limit your advertising identifier in your device's system settings:

• iOS — Settings → Privacy & Security → Tracking, and Settings → Privacy & Security → Apple Advertising
• Android — Settings → Privacy → Ads (the exact path may vary by device manufacturer)

6. Analytics

The app uses Firebase Analytics to record anonymous events such as screen views, test completions, session duration, app version, device model, and OS version. These events help us understand which features are used and how to improve the app. Firebase Analytics does not collect your name, email, or any other directly identifying information from this app.

7. Crash Reporting

The app uses Firebase Crashlytics to report unexpected crashes and errors. When a crash occurs, a report is sent containing the device model, OS version, app version, a stack trace, and a breadcrumb of recent in-app events. We do not intentionally include personal content in crash reports, but stack traces may contain unexpected fragments of in-memory data.

8. Data Retention

We retain information only as long as needed for the purposes described in this policy.

• Locally stored preferences live on your device until you clear the app's data or uninstall the app.
• Anonymous analytics and crash diagnostics are retained according to Firebase's default retention settings, which may be shortened or adjusted from time to time.
• Advertising-related data is retained by Google AdMob in accordance with its own policies.

9. Your Rights

Depending on where you live, you may have the right to:

• Request access to the information processed about you
• Request correction of inaccurate information
• Request deletion of information
• Object to or restrict certain processing
• Request a portable copy of your information
• Withdraw consent at any time

To exercise any of these rights, contact us using the details in the Contact Us section below. Some rights may be exercised directly through your device or through the third-party providers listed in this policy (for example, by resetting your advertising identifier or by adjusting Google's ad personalization settings).

10. Children's Privacy

Age Calculator is not directed to children under the age of 13 (or the equivalent minimum age in your jurisdiction). We do not knowingly collect personal information from children. If you believe a child has provided us with personal information, please contact us and we will take appropriate steps to address it.

11. Data Security

We rely on platform-level security mechanisms and on the security practices of our third-party providers.

• Information transmitted between the app and third-party services is sent over HTTPS / TLS.
• Locally stored preferences are kept in the standard storage areas provided by iOS and Android.
• No system is perfectly secure, and we cannot guarantee absolute security; we use reasonable measures to protect your information.

12. International Data Transfers

Because we use third-party providers operated by Google and (where applicable) Apple, information may be processed on servers located outside your country of residence, including in the United States. By using the app, you understand that information may be transferred internationally, subject to the safeguards described in those providers' own privacy policies.

13. Changes to This Policy

We may update this Privacy Policy from time to time. Material changes will be indicated by updating the Effective Date at the top of this document and, where appropriate, by an in-app notice. Your continued use of the app after a change takes effect constitutes acceptance of the updated policy.

14. Contact Us

If you have any questions or concerns about this Privacy Policy or about how Age Calculator handles your information, please contact:

김민형 (rexyrex) Email: rexyrex.dev@gmail.com