Is OLD SAT still valid?

I’m asking here because I am open to being swiftly proven wrong. My thought process is that it was normed on a specific demographic; ages between 14-22 in 1979 I’ve read. So, I question its validity because:

1. Flynn effect: IQ is a relational statistic, not necessarily a metric of intelligence. Especially with the disparity in general education between now and then, the score could have lost significant accuracy.
2. Age: a lot of u r too old to take it in the first place