Anyone else have less tolerance as an adult?

I’m late diagnosed autistic with low support needs and high masking. As a teen and young adult I struggled with long working hours, studying and bullying etc. But in recent years I just don’t have the stamina or tolerance as I used to. I don’t think I can compartmentalise and suppress like I used to. I also don’t have to anymore either. But I look back and wonder how I actually got through it all? Is this an autistic thing? Is this common experience? Just curious really.