I’ve seen pictures of her. She isn’t.
You’re making a claim of your own - one that is not going to be easy to collect data on (before and after pictures from an untrained 50+ year old), and then using the scarcity of such data as though it were evidence to support your claim.
Here’s a thread from a decade ago:
Where you were arguing about putting on 20-30 pounds or lean muscle mass at 43 because you’ve put in the work and just need to eat right. So, basically, the opposite of this. It’s fine to change your mind over the course of 10 years, but you’re clearly just as much of a “stick-my-fingers-in-my-ears-and-hold-my-breath” conversationalist now as you were then.
You’ve gone from that - which we would all agree is unrealistic - to this, and I’m going to agree with @zecarlo here. You’re projecting. You tried to put on insane amounts of mass as a fat 40-something-year-old, ended up disappointing yourself, and now you make yourself feel better by believing that nobody can put any muscle mass on over 50.