My grandfather started collecting stamps when he was 65. A. My grandfather took up collecting stamps when he was 65. B. Collecting stamps was my grandfather's hobby when he was 65. C. At the

My grandfather took up collecting stamps when he was 65.

Collecting stamps was my grandfather's hobby when he was 65.

At the age of 65, my grandfather was collecting stamps.

My grandfather hasn't collected stamps until he was 65.