That's accurate reporting of what can be observed but doesn't address what makes 'em alive in the first place and keeps 'em that way for a time. On a different time scale you could say something similar about us.

Put someone in an isolated situation (cf the Petri dish) with enough water for survival and the 'onboard' fuel a body carries would keep that individual alive until its fuel ran out. Then the body system would fail and for the individual what we call death would result.

We say we're alive and what I say is we're animated by our soul/spirit - that's what makes us living beings rather than an inanimate collection of complex bits and pieces. Is a single sperm alive until its existence ends when its energy runs out? Or is it inanimate like a firecracker or a candle?

If a sperm is alive - albeit in a simpler way than we are what/who is animating this simple organism?

If it's not alive it is simply a collection of bits and pieces that wriggle around mechanically but give the appearance of something that's alive. Is that the nature of sperm?