Pieter,
Paul McCartney was 61 when his youngest child was born, Cary Grant was 62, Pablo Picasso was 68 and Charlie Chaplin had his last at the age of 73! I'd say you are in excellent company here as a possible future dad-to-be (again!), and wish you and your new love much luck in finding your mutual fulfillment--and remember that SHE will keep you young!
Michael