And, even though things are not perfect, they are a lot better than earlier in life, or so most of us think. But I would suggest that by the time we become satisfied, we have wasted a lifetime by being discontented. How much better would our youth, our college years, those many years of working "for a living," have been if we had realized we were in the exact place God wanted us?
God's Word tells the born again believer to be content in all things, regardless of our age or our circumstances. Luke 3:14 says, "...be content with your wages." Philippians 4:11 says, "Not that I speak in respect of want: for I have learned, in whatsoever state I am, therewith to be content." In 1 Timothy 6:8, we read, "And having food and raiment let us be therewith content." And in Hebrews 13:5, the writer says, "...be content with such things as ye have...."
Yes, contentment with what one has been given by God serves as a humble testimony of His grace toward us, and as a witness to His glory. Proverbs 30:8-9 says, "Remove far from me vanity and lies: give me neither poverty nor riches; feed me with food convenient for me: lest I be full, and deny thee, and say, Who is the LORD? or lest I be poor, and steal, and take the name of my God in vain." And, if you are always wanting to better your circumstances, or you are disappointed in your spiritual growth, you must have forgotten whose job it is to make you like His Son (Phil. 1:6)!
Spiritual maturity comes when we realize we are exactly where God wants us to be!