Never to old! Just be very mindfull of what you are doing and ride defensively. Go for it!!
Try getting your lerners permit and see how you go with the lessons.
No your not... And i bet a lot of people on here have been on group rides and found a lot of so called life time riders are shit riders anyway. Still straight line heros that panic into bends.
a wise man once said "I used to think i was a rider with 26 years experience, but discovered i was a rider with one years experience 26 times over"
Time can make a great rider, but its not a necessity.
like others have said, My Mrs got her RE this year at age 51.
42 ?............... are you for real ?? Get off your ass' and make an effort if you want to ride,........ or book in to the old folks home now .
My wife got her L's at 41. Can't see a problem with it. If you can, try to learn to ride on a dirt bike if you can, you will learn plenty of life saving riding skills as opposed to road riding.
If you are that keen you should not have to ask. Just start small and work your way up. You wont enjoy a big bike untill your confidence is up. Find someone in the know to help you with a starter.