As someone said earlier, at age 21, the Queen vowed to do her duty her whole life, whether it be long or short.
Well, it has been a long life, she might have died 20 or so years ago, but she didn’t. So she is still keeping that vow. The fact that she’s 94 and sits down for Trooping the Colour is no big deal really. Let’s face it, she used to ride side saddle, no mean feat, but we don’t expect her to do that either.
Nothing wrong with retirement, the D of E retired, but he didn’t make that vow.
If Charles and others are stepping up to take on more roles, well it will be good practice for the future.