How can a righteous marriage and upbringing of righteous offspring be achieved, given fears of advancing age and not finding the suitable partner?

When a competent suitor proposes to a girl, he should not be rejected, nor should the marriage be delayed. Indeed, the Messenger of Allah, peace and blessings be upon him, said: "Three things should not be delayed: prayer when its time comes, a funeral when it is present, and a single woman when she finds a suitable match." There should be no exaggeration in seeking the best and most perfect, for perfection belongs to Allah alone. If a man of sound belief, who is diligent in prayers and performs his obligatory duties, avoids major sins, and is known for good morals and conduct, proposes to you, then accept him. He is the one whom the Messenger of Allah, peace and blessings be upon him, commanded to be married, saying: "If there comes to you one whose religion and character you approve, then marry him."