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Kepler 1627A is a G8V star previously known to host a 3.8 Earth-radius planeton a 7.2 day orbit. The star was observed by the Kepler space telescope becauseit is nearby (d=329 pc) and it resembles the Sun. Here we show using Gaiakinematics, TESS stellar rotation periods, and spectroscopic lithium abundancesthat Kepler 1627 is a member of the 38 $\pm$ 6 Myr old $\delta$ Lyr cluster. Toour knowledge, this makes Kepler 1627Ab the youngest planet with a precise ageyet found by the prime Kepler mission. The Kepler photometry shows twopeculiarities: the average transit profile is asymmetric, and the individualtransit times might be correlated with the local light curve slope. We discusspossible explanations for each anomaly. More importantly, the $\delta$ Lyrcluster is one of about 10$^3$ coeval groups whose properties have beenclarified by Gaia. Many other exoplanet hosts are candidate members of theseclusters; these memberships can be verified with the trifecta of Gaia, TESS,and ground-based spectroscopy.

A 38 Million Year Old Neptune-Sized Planet in the Kepler Field