I'm late 50s but as individual as I was when I was 30 years younger and the best gifts I've had have been from people who've picked up and filed away ideas throughout the year from general conversation or comments I've made.
"Hobby" related gifts show thoughtfulness but can be tricky all the same unless you're very confident of what someone wants. I love walking but, for example, boots or leggings really are very personal and need to be tried on. I also love visiting gardens and gardening - but there's a hell of a difference between some random old garden ornament and something you'd choose for yourself. Ditto plants, because so much depends on the available space you have, soil, which way the garden faces and so on. I've had National Trust membership in the past but do check how realistic it is for the recipient to get to many sites .... I found most of the places I wanted to visit were often too far for a day trip.
I love jewellery and tend to go for more quirky stuff but quirky is in the eye of the beholder and it's dangerous to buy something "unusual" because the chances of getting it right are huge.
I would, however, be delighted if someone had taken the trouble to find out my favourite brands and had got me gift vouchers accordingly. In my case this'd be Shaun Leane (on very special occasions), Tatty Divine, Ottoman Hands or Wolf & Badger (who have numerous brands ranging from relatively cheap to 'when I win the lottery').
I love experimenting with perfume so a subscription to somewhere like Parfumado where you choose a different scent each Ormonth would be very gratefully received.
I'm always pleased to get any book from my Amazon wishlist and have no problem getting good condition secondhand books at all if they're ones I want.
Ticket wise, I'd be very happy to get tickets for any of the artists I listen to regularly - particularly as they're so expensive now but again, you really do need to know the recipient's taste. Age is no indication of this! My last gig was the Foo Fighters and Muse before that.
Things I would be disappointed to receive would be any art/ornament (unless I'd previously remarked on it), throws, scarves, gloves, anything 'twee' like Emma Bridgwater or Cath Kidston (subjective), towels, potted plants or tins of biscuits.
But I'm not your mum! Or any of the other women in the same age group as myself. Forget the age thing and just try to pick up cues, and/or sneakily turn the conversation round to, say, West End (or elsewhere) theatre shows, art/museum/history exhibitions, beauty treatments or restaurants she's not been to if your mum's interested in any of that.