I'm a fashion editor, and I've scoured the shops for the best leather pieces for the over-50s. You're not too old to wear it as long as you follow my rules and are NEVER seen in this type of jacket (spoiler - you probably have one!)
There's only one rule when it comes to leather: don't, unless you're prepared to do it completely differently. It's about retiring the leather you used to wear 30 years ago.