I purchased my first race bike at the age of 45. I have been now practicing for 2 years in the Flemish Brabant, not too far from where I live and there are a couple of interesting short and steep climbs with sometimes percentages above the 15% but usually never longer than 200 or 300 m long at the most.
As I am attracted by the mythic climbs, I tried yesterday le Mur de Huy and I really suffered during 6m30 to 7m. I started really slowly and it really helped to produce the big effort in the famous "S". I thought the most difficult was done, but you still have to ride a half km until the top, and the slope is still really difficult apart from the last 100m. I was really happy that I could do it without stopping and I was surprised that my pulses could become normal again quite quickly after the top.