The way I figure it is he's found a way to renew his energy and keep himself from getting older.
7 seconds sound clip from the 4D Man (1959) movie soundboard.
You can hear this line at 01:09:37.779 in the DVD version of the movie.
Quote context
[...]
- Yeah.
- I usually drink what costs the most.
- In that case, he ought to be pretty old by now.
- The way I figure it is he's found a way to renew his energy and keep himself from getting older.
- You're trying to tell me that your brother can get energy, time from other people?
- That's why a young doctor dies of old age.
- Get out an all-points on Dr. Scott Nelson.
[...]