Your vet should absolutely see Simba even if he hasn't had his vaccinations in a while. There are many things that may be going on so a full bloodwork panel should be done. One problem old cats can develop is hyperthyroidism which can affect their behavoir. Also cognitive disorder, which is sort of like kitty Alzheimers can affect their behavior with wandering, vocalizing, etc. Cats can also lose some hearing which oftentimes makes them more vocal - They can't hear themselves so they crank up the volume. There are treatments for many of these problems but proper diagnosis is needed by your vet.
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Holistic Wellness Care
