Stocks are mostly higher Monday as the aging bull market turns 6 and Apple investors ponder the launch of the tech titan’s “Watch.”

As of 1:25 p.m. ET, the Dow Jones industrial average and S&P 500 are up 0.7% and 0.4%, respectively — a triple-digit gain for the Dow. The Nasdaq composite, which has been crisscrossing the break-even mark, is 0.2% higher.

10-year Treasury yields are declining, but still north of the 2% mark. Oil sold on the U.S. market, which has edged above $50 a barrel, is rising.

More details on the Apple Watch are coming at an ongoing company event in San Francisco. It’s been previously announced that the smartwatch — the company’s first big rollout since the iPad — goes on sale in April, with three editions starting at $350.

UH-OH: Is the aging bull in ‘late innings?’

The stock bull market, the one Wall Street predicted would have a short life span when it was born in the shadow of the worst downturn since the Great Depression, turns 6 Monday.

Ironically, despite tripling in value and clocking in as the fourth-longest and fifth-best performing bull market ever, the bull is again facing questions about its longevity amid fears that a key plank of the bull thesis – historically low interest rates driven by Federal Reserve stimulus policies – may be nearing an end.

In corporate news:

■ GM announced a $5 billion stock buyback program. GM shares climbed on the news.

■ Alcoa said it plans to buy RTI International Metals for $1.5 billion. The deal, aimed at boosting the Pittsburgh icon’s aerospace business, gave a 40%-plus rocket boost toRTI shares.

■ McDonald’s announced worse-than-expected February results, with same-store sales dropping 4% in U.S. stores. Despite that news, MCD shares are up a bit.