Hi and welcome DMB.
As a long time and long distance runner in the past, I can sympathise with your aches and pains.
I had to give up my running when damage to my left Knee (all that pounding from the road surface) made it to difficult to continue.
I switched to regular cycling as an alternitive hoping my Knee problem would hold up O/K once the constant stresses to my joints from the road surface was eliminated.
Am glad to report all is holding up well (touch wood),
Just take it steady when you first begin cycling, stay on as flat a road surface as you can find until you build up some power for cranking, avoid to many big or steep hills while you monitor the injury`s sustained from running and most of all ,enjoy the experiance.
Good luck....