At what age do you know what love is?

I think you can know what love is at any age. I think even infants have a basic understanding of what love is, even if they are not able to communicate it in a way that we understand.

It depends upon the person maturity level.

You can know love at any age. Just different levels of love. Like loving a parent or a sibling. Or loving a friend at a friendly level. Then you move into love in an intimate way. And that can sneak up on you at any time. But there is a huge difference between a crush and love. You just have to figure that out by going through it

You can feel love at any age, although it takes experience to realise the depth of that love, and how ‘true’ and filled with good intentions it is.

The first time I felt romantic love was around age 21. I had dated before then, but don't think my feelings for my boyfriends were actual love.

at the age of 16 may be .at that age you are too curious to find out new things and may be at this time you find out what love is all about.