Welcome, Pieter! Congratulations on your birthday! 
You will see there are many people here of your age. I started last year at 50 years old, and soon saw many people have started at my age, and people starting after retirement. It is never to late to start. The best age is whatever your age is when you hear the “call of the bass”.
Check the Introduce yourself thread and say hello there.
Interesting fact: there is a lot of people here from the Netherlands!
Welcome and have fun!