How old is the non-failed strut?

I once replaced only one strut on the rear of my 500E (they cost $400+ each), since it had only 44k miles on it at the time. No problem there. However, I'm inclined to think you need to do both fronts, unless the good one's fairly recent

__________________
"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss

Michael
2014 E63S Estate
2006 SLK55
1995 E500
1986 Porsche 944 turbo