Today is father’s day in Australia.

It’s all a bit confusing between North America and the southern hemisphere, so I just say, no formality, nothing, just ignore it. Researchers at Stanford University reviewed data on 168,867,480 live births from 1972 to 2015, making statistical adjustments for missing paternal records. The average age of the father of a newborn in the United States, the investigators found, has risen to 30.9 from 27.4 in 1972.

Paternal age increased across the country: the oldest fathers lived in the Northeast, and the youngest in the South. There were average age increases across all educational levels, races and ethnicities. The report appears in the journal Human Reproduction.

In 2015, fathers with college degrees were 33.3 years old on average, compared with 29.2 for those with only a high school diploma. Asian fathers were the oldest on average by ethnicity, and blacks and Hispanics the youngest.

My first kid was born when I was 24.

I’m 54 and have an 8-year-old.

I get to go watch my daughter play hockey this afternoon, and will sit in the stands and enjoy the moment – mindfully.