2002 Volvo S60 Timing Belt Replacement

It is not suggested to replace timing belt until around 100,000. However, since my car is 7 years old with only 58,000, should I go ahead and have it replace. My Volver dealer service dept said it was drying out due to age. If replaced, is there anything else I need to do since timing belt requires engine to be pulled (I think). Thank you.