Are you an introvert? As you have aged are you becoming more introverted? Traveling solo seems to fit well for an introvert's personalities but all types can travel alone. There are plenty of places that can cater to both introverts and extroverts.
If you do not like crowds, you can consider the following places.
Six Places Recommended for Introverts:
1) New Zealand
2) Camino de Santiago
3) Finland
4) Mongolia
5) Bhutan
6) Sedona, Arizona, USA in the winter months for less crowds and less heat.
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