Is age only a number?
Society often views older men dating younger women as a clear sign of a midlife crisis. The reason you have similar personalities and outlooks may not be a good thing. How do your friends and family feel about it? Do you know his family and friends? If either of you are keeping the relationship a secret, that is a bad sign.
Right now he is attracted to your youth and beauty, and your admiration of him as the experienced older man. Age difference in couples — seeking an ideal? Lots of men and some women are attracted to youth, but the ideal age gap between men and women of lasting relationships is 0-5 years.
I guarantee your outlook and even parts of your personality will change in the next decade, and your feelings will likely change as well. You may indeed be very mature for your age, but he may be immature or looking to escape being an adult. Ultimately, you will grow to want and know you deserve someone that is an adult, not a boy in a man's body.
There are other concerns that you need to consider when dating a much older person. You are not in the same generation and will not have those things in common that bond a couple closer in age. Things that do not seem important when you are in love, become extremely important in the daily reality of life later.
Third, you need to consider if you ever want to be a mother and to share the magical firsts of bringing life into the world with a much older man. Is he already a father? Is he willing to have more children? Are you going to feel ripped off when your kid has the oldest dad in the room?
Sexually you may be turned on by an older man's attention, and he has had a lot of experience seducing women over the last two decades while you were...well, do the math. Even if this man is mature "enough" for you now, psychologists agree that this type of age difference will confirm a "parent-child dynamic" where you are never equals, and the lack of true intimacy is the reality.
Also, physically you must realize that while you may become even more attractive in the next decades, his looks will likely deteriorate and his sex drive (think Viagra) and ability will diminish. He could also develop health problems and die decades before you.
In the end, society in general will have its jokes about "sugar-daddies" and "dating a baby" and you can choose to ignore it. You can ignore the real concerns, statistics and research and even find exceptions. Just don't ignore yourself, your instincts, and your long-term needs and aspirations. If you want to play, play...but know it.