My mum is in her late 70s. She instinctively refers to people only a couple of years older than her as 'old people'. She gets Lego sets for her birthday. She owns an animatronic Grogu. Ask her who her favourite Marvel character is and she will tell you it's Deadpool.
Your mum sounds cool.
Mine also thinks people near her own age are old and doesn't see herself that way. But my mum is in care home.