The saying "Age is just a number" varies on different factors for me. It is based upon what is the topic that needs to be discussed.
When we speak about it by love, indeed age is just a number for the people falling in love. We do not fall on the looks, age, or physical attributes of a person. We fall for their character, how they see things in life, and of course maturity. Often times older people think maturely and there are people who love it. That just simply means they're focused in growing in life and that's a good person to spend your life with.
Speaking about energy, age is very relevant. When we are young, we have 100% energy, 100% time, but almost 0% money. When we're on our 20s, our Money increases. But as soon as the age increases, our energy becomes less and less. Therefore, age is relevant when we speak about life energy. You can no longer do the things that you used to do.
Age is not relevant to maturity. There are people who are very matured even at a very young age. Its all about how are mind is ready to interpret those things in a manner that is aligned to what is right in life. There are people who become matured at their 50s so basically age does not define someone's maturity.
I agree with that statement and I'm going to explain why.
You have to make a difference between your actual age and your body age.
Your phisical age is what it is, you can't change it, so for me it's just a number.
Your body age is different and that's the most important thing. Your body are can be less than your real age or way more, depending on how much do you care about your health.
Of course there are diseases that can't be avoided and theated, these can cause a lot of damage to your body and make your body older than it actually is.
However, my eating healthy, exercising regularly and living a balanced and healthy life, you can make your body age less than your actual age.
And if you're fortunate to have good genes, you can look more younger as well.
That statement, as far as I understand it, expresses the opinion that age is mainly a state of mind than an objective fact. To some degree, it is true. It is possible give up on things prematurely. Aging, though, involves biological processes that may or may not be slowed down with the right habits. Eventually, we will all succumb to the ravages of old age unless we die first. There are also social aspects to aging that one may be powerless to change. Age is a number but to what degree it is "just" a number is not entirely, not even close, up to us but biology and the community in which we live.
Age is a indication of time. How long you are here in this universe, age defines that. When you become very old, your physical condition will not be the same like at your 20s.
Life is short, but it is not so short that we usually think. Life is long. When you are 22, you think age 40 means finished. When you are 40 years old, you realize that how young you feel inside. It feels the same.
Because of advancement of medical science, eating healthy and doing exercise, people stay healthy and fit. Their physical condition is pretty good. You cannot imagine how active a 45 years old man or woman.
It is the feeling that matters. If you are young, but you think and act like an old guy, you are not young. What you feel inside, that is the most important thing. It feels the same when you are 45. So, I think age is just a number. Your feelings, thought and action define everything.