Selling stock…capital gains question:

First time ever selling stock.

Hypothetical question:
Say i bought 100 shares in 1980 at cost basis of $500
Capital gain was another $50,000

Then 2021 I bought another 100 shares at a cost basis of $30,000
Capital gain of $3,000

I would want to sell the 2021 stock to avoid paying higher taxes right?

(sorry if I sound stupid)