Learn English – a synonym for “childless” but less negative

I'm writing a bullet list of traits for people to review so that they can self-select whether they fit into a certain group.

What I have right now looks like this:

• Male
• 35-39 years old
• Highly-educated
• In a committed relationship
• Childless
• Athletic, fit

But "Childless" feels problematic. It may have a provocative feel to it, and it focuses on the absence of children almost as if I (or society) expects men to have children. I'd rather describe a trait in positive terms.

Is there a word (or phrase of 4 words or less) that can serve as an adjective meaning simply (and without negative connotation or judgment) that he hasn't fathered any kids?

When I search thesauruses (e.g. this one), the suggestions are even worse than "childless". They include words such as: sterile, barren, infertile, unproductive, impotent, arid, bereaved. None of those are appropriate.

If I'm being overly cautious, and enough answerers say that "childless" meets my requirements, then that will be interesting for me to hear, too.

P.S. I've used the "single-word-requests" tag because I'm looking for suggestions of one word (or small phrase), and I've researched several thesauruses, and I've provided context.