This thread seems to have covered a fair few topics, but the original point of extending concessions for more young people is a great idea, and well deserved for younger people who have suffered more than older groups during the pandemic with a loss of employment and opportunities.
I am 6' 2"" and I do sympathise with anyone of that height who needs a seat in the main stand. For Youth Cup games and the like, I would try to get an aisle seat, but that will be harder at a well-attended match. Fortunately for me, my legs are good, and it's more comfortable to stand.
I am more worried about older people who don't have access to the internet, rather than the concessionary price. I know there was a contact form sent out with the email for season tickets for people who would have trouble booking online, but that was sent as an email! I hope there is an effort to contact supporters who don't have an email address. Anecdotally, and I am sure I don't have all the facts, I did speak to a long-standing older supporter tonight who had gone down to the club offices, and was told that they could only get tickets online, and there was no alternative.