Your are 43, witha dipolma in computer hardware and networking and keen to have a degree. You are currently a computer technician. You can consider short term vocational courses ( designed specially for people with age gap and time gap in education and work) with your current education and then complete your studies by distance mode or evening college methods
1.Please have a look at Institute of Solar Technology, that is registered under Government of India, NITI Aayog scheme.
This offers a certificate program for Solar engineers. the minimu education needs are 10th + diploma with no upper age limit. It has branches around the country
(http://www.istindia.org/admission/ist_branch_location.php) and you can choose based on your situation.
2. The government set up a National Scheme of Apprenticeship Training to help people in your situation and has four Regional Boards of Apprenticeship.
For instance the southern division (http://www.boatsr-apprentice.tn.nic.in/List-Vocational.html) has 128 vocational course, you can look at course number 119(Computer Assembly and Maintenance),123(Computer Science) etc. Among the engineering courses (http://www.boatsr-apprentice.tn.nic.in/List-EnggTech.html), you can look at 13(Computer Engineering), 70(Computer Science/Computer Application).
a.The Chennai unit contacts are Phone : +91-44- 22541292 / 22542236, Fax : +91-44-22541563, E-mail : firstname.lastname@example.org
Similarly you can check out the
b.Mumbai division (http://www.apprentice-engineer.com/)
This would give you a stipend, hands on experience and a vocational degree. If interested you can read the report about how this programs helps students like you (http://www.boatsr-apprentice.tn.nic.in/NPM.PDF). You can read about eligibility criteria, benefits, stipend and site visits.
3. You can also consider the summer/winter job orientated training program at Advanced Level Telecom Training Centre (ALTTC), Ghaziabad under BSNL and Government of India.
You can choose any of the 4-8 week course (http://www.alttc.bsnl.co.in/student_online/detailed-brochure.pdf) listed here.
4. Once you complete one of these course, get a good job, then you can enroll at IGNOU for BTech ( no age bar + Diploma in computer accepted). You can also look at the Vertically Integrated Engineering Programme(VIEP) of IGNOU that offers bachelor's degree in Computer science also (http://www.ignougradecard.co.in/ignou-viep/).
5. Once you do a bachleor's degree and if you still have the passion to study, you can always take up masters in the same distance mode. You can choose Mtech in IT or MCA