Almost right.Yes, Gimeno is the oldest winner in the OE at 34 years and 9 months. The oldest ever is André Vacherot at the age of 40
34 years, 10 months and 1 day.
Nadal is the oldest RG champion in the Open Era and All Time winning 7 matches (Gimeno won 6), at the age of 34 years, 4 months and 8 days.
The previous owner of this distiction was Australian legend Ken Rosewall who won the same quantity of matches as the Spaniard, at age of 33 years, 7 months and 7 days.