Is my battery broken?

Hello, I have a question for you….. My Golf 6 (10 years old) still has the first battery (60Ah) I suspect that the battery will break slowly, which may be after 10 years. 2 weeks ago the rest voltage of the battery was 12.2V. After that it was charged until the charger “ready” indicated. Voltage after charging: 12.4V Today the rest voltage of the battery is only 12.2V. Is this normal? Is the battery broken or just before? Thank you for E Grus PS: I use my car only 3x per week for a total of 120km (per week)