I was watching the Flash TV series, and I was wondering how old Superman/Kal El is supposed to be in that series.
In the pilot and first season opener of Supergirl (2015), which introduced the Tyler Hoechlin Superman, Kara states:
"24 years ago, my planet Krypton was in serious peril. My cousin, Kal-El, was sent to a planet called Earth for his own safety and protection. You may know his story."
Kal-El was born in 1979 (Earth time) and arrived on Earth relatively instantaneously. Compared to Kara, born in 1966 (Earth time) and arriving on Earth in 2003, appearing like a 13 year-old.
Accordingly Superman is presently 42 or so.
However, age for the Supergirl cast is notoriously misaligned; oft highlighted is how Lilian Luthor, played by Brenda Strong is 61, is the mother of Lex Luthor, played by Jon Cryer who is 56.