First of all, well done you! It's a great feeling to improve at something physical, at any stage of life! I can say that because I think I'm older than you...
I rode it on Sunday too. I have done it before in the late 90s. Fwiw, here are my observations:
* More people therefore more congestion and frustration of having to stop and walk
* Riders are on better bikes - much bling on display
* Higher max speeds (mine was 73 kmh)
* More accidents and therefore more ambulances
* Nevertheless, there were more people walking up the beacon (odd given the better bikes, not me mind

I ground up it last time and I did the same this time)
* Enjoyed listening to someone else's music blasting while climbing the beacon (including the Tour de France theme tune!)
* Sadly, one death