It's just that an 80+ person can limit their movement by choice without having effect than feeling really bad about it, whilst a working age + kids can't.
Well they can, but that limited movement and lack of social contact was awful for my two grandparents, both went rapidly downhill when their social contact was removed from them.
I'm also clinically vulnerable. I teach and have limited protection at work, no social distancing, etc. I caught covid and was pretty poorly including being rushed to hospital due to it.
However, I'm still less of a risk to people in my grandparent's age bracket. Had they survived this year I would definitely have wanted them to go before me for the vaccine. I want my parents and MIL (60s and 70s, retired, no additional health/risk factors particularly) to go ahead too even though they could technically put their lives in hold easier than I could. They need to see their family, they need lives out of their homes.
I really do believe that it has to be done of risk factors. Those who are of greater risk to covid should be first to get the vaccine, working its way down to those at the lowest risk levels. I believe this is what they've done.
I just would like to see the next bunch of priorities after that for the under 50s with no medical concerns. Those most at risk of long covid need to be next in line and those who have prolonged contact with others with no real way to follow,social distancing guidelines, etc such as school and college staff. I'd include university staff in that too so that they can get back to teaching face to face and allow students to be working properly together in university classrooms.