Contentment is a great word as it conjures up a whole heap of thoughts for everyone, it's a very personal trigger for each persons philosophy and their approach to what it means can be so different. I don't know whether my view of contentment has actually changed as I've got older or whether, like a sculpted block of stone, the superficiality of what I thought it meant has been chipped away through experience. When I was younger it would be 'when I get a job I'll be content' and then 'when I get a decent car' and then 'when I own my own property' - frankly I was living The Smiths song 'Heaven Knows I'm Miserable Now'.
Through experience and a deeper understanding of life and my faith I realise it is simple, be satisfied with what you have and enjoy it for what it is. That doesn't mean stop trying to better your situation, just don't lose sight of what you have.
I'm a lot less stressed nowadays.
“And why do you worry about clothes? See how the flowers of the field grow. They do not labor or spin.”