It's changed my BIL's life. His was replaced young, and he held on as long as he could cope with the pain as they generally last 10-15 years and he'd be out of replacement options by the time he was a pensioner. As said, get exercising it, and cycling is no impact. A colleague's husband had both replaced, and he was back climbing again - and he was in his 60's - I'd deffo speak to a private physio for a plan if the NHS aren't much use - the MHS physio's just weren't allowed to do anything, and frowned upon me cycling again after breaking my spine. I went private, and the physio got permission from my consultant to start work, and a plan, as she needed to know when would be safe after my bad break. I'd have never recovered well if I left it with the NHS.
Unfortunately, NHS physio's are time restricted, and for most people, it's off you go, sort yourself out. They spend most of their time with old people. That's why you see so many leave and enter private practice, as all the studies go somewhat wasted on getting old folk to get up - it's essential work, but not exactly what they trained to do.