You can't retire until your 55, at least if you're looking for the payout based on years of service, pro-rated bonus/shares, etc. You also need to be 55 to quality for the free financial advise after you leave. The healthcare benefit, HCAP, has different eligibility -- i believe 10 years of service and age 40 or 45. HCAP is available after COBRA expires. The problem is HCAP is extremely expensive and you're likely to find cheaper insurance elsewhere. Take a look at the ACA plans. RHRP isn't available until age 55.
So long story, leaving before 55 you don't really get anything except the access to HCAP which might be cost prohibitive, but do your own research. Staying until 55 you get the retirement package, but only you can decide if it's worth sticking around for it as that isn't that great either. I'm 52 and have been with the company for 25+ so in a similar situation as you. The docs are all available through Fid Central if you want to read through the details. There's also a video on fid vid i believe as last year they had a seminar for those that qualified to try to promote the retirement benefits. I wish they changed eligibility to rule or 70 or similar age + years of service milestone.