One of the most popular ways for a man to style a shawl cardigan is to marry it with charcoal jeans for a laid-back look. Finishing with low top sneakers is an easy way to introduce a mellow vibe to this ensemble. As you see, even in your 50s your outfit options are in no way limited.
Consider pairing a shawl cardigan with grey shorts for a simple outfit that's also put together. As for the shoes, you could follow the casual route with a pair of low top sneakers. This outfit shows that even after fifty you still have a wide array of styling options.
This is definitive proof that a shawl cardigan and blue jeans look amazing when you pair them up in an off-duty ensemble. Finishing off with a pair of low top sneakers is the simplest way to infuse an air of stylish nonchalance into this look. Ideal to show people that you're mature enough and confident enough to hold your own in the style department.