The main thing that I would infer here is that while Senators in 2022 are older than they used to be, so is the general population. Proportionately, the current Senate isn't any less representative with regards to age than they were in the '50s and '60s.

I'm not implying anything else with this data really. In another comment I explain that the Senate was always intended to be a bit older than the House, although the Founders probably did not anticipate these kinds of ages (the median age of the first Senate was 47.5 years).