I notice several well-worn clichés creeping in here, the first being in the title's assumption that anyone who's an OAP must be almost incapable of getting out of one train and onto another. It's true that the last time I changed at Clapham Junction for Gatwick was before Covid, and that nowadays I would try to minimise the weight of my suitcase, but I could still do it even if the lift wasn't working, and I've been receiving the state pension for almost 19 years.
Second, we can all think of situations where when we get out of train 1 it's a long wait till train 2 arrives, but I think that problem is often exaggerated. I remember a letter in one magazine which said that none of the trains at Manchester Piccadilly connected with another. As there must be thirty or more arrivals and departures there each hour that's a ridiculous claim. What the writer meant that his particular connection wasn't as quick as he'd like.
Third, on a busy route timetabling a wait for one train to provide a connection from another one not only adds to the length of the journey for those in the first train who aren't changing there, but it may create connection problems further along the line, or congestion because more than one service will be wanting to occupy a section at the same time.
Fourth, and this more difficult, is the question of whether a train should be held so that a connection can be made from a late-running service. Not holding a train inconveniences those wanting to change from the service that's running late. We cannot tell what inconveniences may be caused to passengers on the first train which, if held, will now be late further along its journey, but it's unrealistic to suppose that the only reason for not holding it is to maintain the TOC's on-time arrivals statistics. There must be scope to consider at what times of the day a train should be held, and for how long, and when it shouldn't be held.