It could be 10 years old, more or less. It is a Pentair SuperFlo, a medium head pump. Your pump is an up-rated 1hp (a full-rated 3/4hp). A full-rated pump would say 1.65 S.F.HP. on the label. Yours says 1.25 S.F. HP.
If you wanted to go VSP, a V-Green 165 will bolt right on (new shaft seal and O rings needed as well.)