Feels so for me. I'm nearing 46, and all through my 30s I felt (and was told) that I seemed younger. My wife passed from cancer when I was 39 and I feel like all that time caught up to me in the next year or so. Now I feel (and I think, look) age-appropriate, have begun to definitely feel the aging. However, I've also made more serious efforts towards good nutrition and exercise and am feeling much healthier than other periods of my life. But mentally, I'm incredibly presently aware of every day and how uncertain any future days with anyone, let alone myself, actually are.