I had no idea he was in his 80s (older than my parents would be), and that he did Walker, Texas Ranger when he was in his 50s. The final episodes aired when he was 61! That's nuts.

Not a fan of him in real life (based on how he portrayed himself publicly), but I do find his level of physical fitness even more impressive back in the 1990s (and even up until his death), given his age.